Filmed live at the launch of data.gov.uk, Tim Berners-Lee, Nigel Shadbolt, Richard Allan and Chris Taggart join the Guardian's technology director Mike Bracken to discuss the issues and opportunities surrounding the release of government data

Sir Tim Berners-Lee, founder of the World Wide Web, and Professor Nigel Shadbolt present the reasons and their vision for opening government data on the Web at the launch of data.gov.uk at the Guardian